340 Proceedings of the Royal Society of Victoria. 



Observations. — Our specimens closely agree with Barrande's 

 figured specimens. H. novellus is one of the few longitudinally 

 striate forms of the genus. The angle of divergence is about 20°. 

 Barrande's specimens were from Stage G. (Lower Devonian) of 

 the Bohemian area. 



Occurrence and Horizon. — Found in the bluish-grey mudstone 

 out of the shaft in the tunnel of the Reservoir at Yan Yean. 



Coll. Geol. Surv. of Victoria, Bb 13. Silurian (? Melbournian). 

 [1123-4]. 



Hyolithes sppyi, sp. nov. (Plate XXXI., Fig. 9). 



Specific Characters. — Shell conical, straight, or with a slight 

 curvature to one side, extremely sharply pointed. Lateral 

 margins acute, having an angle of divergence of about 21°. 

 Surface of shell marked with tine, tran verse and arched growth 

 lines, and occa.sional broader and slightly convex bands. 

 Operculum sub-elliptical, ventral edge regularly curved. The 

 umbo is situated at | of the width from the base. There is a 

 distinct fold proceeding from eithei- side of the umbo to the 

 lateral mnrgins. Surface of operculum concentrically and finely 

 striate. Length of tigured shell, 23 mm. ; breadth at aperture, 

 9 mm. 



Observations. — The form of the shell in this species is somewhat 

 like that of H. elegans, Barrande, an Upper Ordovician form.^ 

 It differs, however, in being straighter, in having a less dilated 

 aperture, and in the details of its ornament ; there being no 

 longitudinal markings on the surface of H. spryi. 



Occurrence and Horizon. — Found in the dark argillaceous rock 

 of Domain-road, South Yarra. [1127-9; 1121-2]. Collected 

 and presented by Mr. F. Spry. Also in the bluish mudstone, 

 near the Botanical Bridge, South Yarra (Yarra imj)rovements). 

 [1120]. Collected by Mr. F. Spry. Silurian (Melbournian). 



(ieiius Conularia, Miller. 



Conulapia sowerbii, Defrance. (Plate XXXI., 



Figs. S, 10, 11, 12). 

 Conularia sowerbii, Defrance, 1825. De Blainville, Man. 

 Malac, p. 378 ; atlas, pi. xiv., tig. 2. 



1 S.vst. Sil., 1867, vol. iii., p. 81, pi. xi., figs. 14-25. 



